Students at the school said prayers for Zynab on Wednesday morning and have been given access to counsellors.

A closed-circuit camera captured the moment of the blast, showing a busy avenue. A huge fireball engulfs a building, forcing cars to scramble to get away.

Other videos of the attack posted on social media show wounded and bloodied people crying for help on the footpath outside the ice-cream parlour.

In a second attack, an explosives-laden car exploded during rush hour near the state-run Public Pension Office in Baghdads busy Shawaka area, killing 14 people and wounding at least 37, a police officer said.

In separate online statements, Islamic State claimed responsibility for the two attacks, saying its suicide bombers targeted gatherings of Shias.

The attacks came just days into the holy month of Ramadan, when Muslims fast during daylight hours.